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sed or awk: delete n lines following a pattern
...
Explanation:
-v regex="$regex" -v count="$count" defines awk variables based on shell variables of the same name.
$0 ~ regex matches the line of interest
{ skip=count; next } initializes the skip count and proceeds to the next line, effectively skipping the matching line; in the 2nd solution, t...
How to clear the interpreter console?
...s file in your python search path:
# wiper.py
class Wipe(object):
def __repr__(self):
return '\n'*1000
wipe = Wipe()
Then you can do this from the interpreter all you like :)
>>> from wiper import wipe
>>> wipe
>>> wipe
>>> wipe
...
How would you count occurrences of a string (actually a char) within a string?
...ed.
Also, for multicharacter substring you should use the following code (based on Richard Watson's solution)
int count = 0, n = 0;
if(substring != "")
{
while ((n = source.IndexOf(substring, n, StringComparison.InvariantCulture)) != -1)
{
n += substring.Length;
++count;
...
Git: How to remove file from historical commit?
...refs.
The filter-branch approach is considerably more powerful than the rebase approach, since it
allows you to work on all branches/refs at once,
renames any tags on the fly
operates cleanly even if there have been several merge commits since the addition of the file
operates cleanly even if t...
What's the difference between echo, print, and print_r in PHP?
I use echo and print_r much, and almost never use print .
11 Answers
11
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Empty set literal?
...>> print(s)
set()
this is basically a more condensed way of doing {_ for _ in ()}, but, don't do this.
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What are the differences between the threading and multiprocessing modules?
...nd a thread pool like this:
with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
executor.submit(job, argument)
executor.map(some_function, collection_of_independent_things)
# ...
You can even get the results of those jobs and pass them on to further jobs, wait for t...
Is there a performance impact when calling ToList()?
...collection contains say 33 elements the list will end up using an array of 64 elements wasting some memory.
In your case the source collection is an array which implements ICollection<T> so the performance impact is not something you should be concerned about unless your source array is very...
Google Chrome form autofill and its yellow background
...a with white. I tried all the solutions on this page, including the jquery based ones and they didnt work for me, in the end i had to add autocomplete="off" to the field.
– Myke Black
Mar 28 '14 at 15:05
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warning about too many open figures
...) will remove a specific figure instance from the pylab state machine (plt._pylab_helpers.Gcf) and allow it to be garbage collected.
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